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Posted to dev@lucene.apache.org by "Andrzej Bialecki (JIRA)" <ji...@apache.org> on 2018/01/10 11:29:00 UTC
[jira] [Updated] (SOLR-11714) AddReplicaSuggester endless loop
[ https://issues.apache.org/jira/browse/SOLR-11714?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Andrzej Bialecki updated SOLR-11714:
-------------------------------------
Attachment: SOLR-11714.patch
The root issue for the loop was that the Policy framework can properly account for effect of its planned changes only for a few predefined parameters (cores, diskfree, cpu, etc). However, both SearchRateTrigger and MetricTrigger generate events that correspond to more complex cluster state.
This patch modifies the way these triggers work, and also significantly simplifies {{ComputePlanAction}}. Instead of relying on the Policy framework to figure out what and how many operations are needed these triggers specify requested operations explicitly in the form of action+hints, leaving only the target replica placement aspect to the Policy framework.
> AddReplicaSuggester endless loop
> --------------------------------
>
> Key: SOLR-11714
> URL: https://issues.apache.org/jira/browse/SOLR-11714
> Project: Solr
> Issue Type: Bug
> Security Level: Public(Default Security Level. Issues are Public)
> Components: AutoScaling
> Affects Versions: 7.2, master (8.0)
> Reporter: Andrzej Bialecki
> Assignee: Andrzej Bialecki
> Attachments: 7.2-disable-search-rate-trigger.diff, SOLR-11714.diff, SOLR-11714.patch
>
>
> {{SearchRateTrigger}} events are processed by {{ComputePlanAction}} and depending on the condition either a MoveReplicaSuggester or AddReplicaSuggester is selected.
> When {{AddReplicaSuggester}} is selected there's currently a bug in master, due to an API change (Hint.COLL_SHARD should be used instead of Hint.COLL). However, after fixing that bug {{ComputePlanAction}} goes into an endless loop because the suggester endlessly keeps creating new operations.
> Please see the patch that fixes the Hint.COLL_SHARD issue and modifies the unit test to illustrate this failure.
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